Download New Parametric Current Transformer

New-PCT
New Parametric Current Transformer
for non-destructive measurement of
average beam current...
The New Parametric Current Transformer is the
latest evolution of the Unser Transformer,
commonly called DCCT, developed at CERN in
1966 by Klaus B. Unser.
Full scale range from ±20mA to ±20A
controlled by TTL levels
5 uA/sqrt(Hz) resolution in every range
1 uA/sqrt(Hz) or lower resolution on option
Frequency response DC to 10 kHz
Linearity error < 0.1%
Sensor inner diameter from 55 to 245 mm to fit
around any vacuum chamber
New-PCT vs. “Old” PCT comparison
Insensitivity to synchrotron revolution frequency
(either single bunch mode or uneven fill pattern)
Residual modulator ripple is eliminated (full
bandwidth usable down to very low current)
Electronics can be 130 meters from the sensor, far
away from radiation sources
Independent external calibration possible up to ±20A
Test function injects +100mA in sensor under user
control
Range remote control by TTL levels
NPCT package includes spares for electronics and
power supply
New-PCT Chassis with NPCT-E electronics and power supplies
NPCT with 175-mm sensor head
Application
The Parametric Current transformer is used on most
particles accelerators in the world to measure the average
beam current. It is an essential instrument for machine
tuning and commissioning.
The large dynamic range, the wide bandwidth and high
resolution make it the ideal instrument to measure beam
lifetime in storage rings.
It is often the only truly calibrated beam instrument in an
accelerator and serves as a reference to calibrate other
beam diagnostics.
Operating principle
The NPCT works on the principle of the zero-flux DC
current transformer (DCCT). The DC component of the
current flowing throught the toroid sensor is detected by
a magnetic modulator also called fluxgate or second
harmonic detector.
The AC component is detected by a AC Hereward
transformer. The two circuits are cascaded in a common
feedback loop to generate a magnetic flux which always
cancel the primary currrent flux. The NPCT ouptut is the
voltage developed by the feedback current passing
through a precision resistor.
V.2.1
Specifications
Sensor head
Full scale ranges
Range control
Output
Output over range
Output bandwidth (-3dB)
Response time (@ 90%)
Resolution
Standard model
High Resolution model
Very High Resolution model
Output accuracy
Linarity error
Temperature coefficient
Operating temperature
Output impedance
Output current
Output connectors
Test function
Test control
Calibration winding
Calibration current
Calibration connectors
±20mA, ±200 mA, ±2A, ±20A
2 TTL lines on rear panel(DB9)
±10 V
up to ±12V
8 kHz in 20-mA Range
10 kHz in other ranges
< 50 us
Connector
Temperature coefficient
Sensor baking
Radiation resistance
< 5 uA/sqrt(Hz)
< 1 uA/sqrt(Hz)
< 0.5 uA/sqrt(Hz)
± 0.1% ± zero-offset (can be
zeroed) ± magnetic field and
temperature drift
< 0.1%
< 0.1uA/K typ.
-40...80°C
100 Ω
10mA max, source or sink
Isolated BNC on rear panel and
front panel
Injects +100mA in sensor
TTL line on rear panel (DB9)
10-turn floating calibration
winding on sensor
from external source (2A max,
Z > 100 Ω)
Isolated BNC on rear panel and
front panel
Sensor saturation flux
Bandwidth
200-mA Range
Destructive level
Sensor sensitivity to
external magnetic fields
OD
DB15 male
5 uA/K typ.
< 120°C, 250°F.
Optional radiation-resistant sensor
made of radiation-resistant
halogen-free materials
DC current: Unlimited
Pulse charge > 100 mC
10 mT (axial) typ.
2 mT (radial) typ.
10 uA/mT (axial) typ.
1 mA/mT (radial) typ.
ID
H
C
not to scale
C = 56mm max
NPCT-xxx
order codes
ID
(min)
OD
(max)
H
(max)
Weight
(Kg)
NPCT-055NPCT-075NPCT-115NPCT-130NPCT-175NPCT-195NPCT-202NPCT-245-
55
75
115
130
175
197
202
245
98
118
158
175
222
250
248
298
108
108
108
108
108
108
108
108
0.9
1.2
1.7
2.0
2.4
2.6
2.7
3.3
Distributors
Voltage Noise Density
2 uArms/sqrt(Hz)
0.2 uArms/sqrt(Hz)
20-mA Range
High Resolution Sensor
U.S.A.: GMW Associates
955 Industrial Rd.
San Carlos, CA 94070, U.S.A.
Fax: (650) 802-8298 - Tel.: (650) 802-8292
[email protected] www.gmw.com
Japan: REPIC Corporation
28-3 Kita Otsuka 1-Chome
Toshima-ku, Tokyo 170-0004, Japan
Fax: 03-3918-5712 - Tel.: 03-3918-5326
[email protected] www.repic.co.jp
Manufacturer
NPCT package includes:
One NPCT sensor head
One interconnect cable
One 19” 3U RF-shielded chassis, with
Two power supplies, autorange AC input (one as spare)
Two NPCT electronics cassettes (one as spare)
Ordering codes
NPCT
-XXX
-CXXX
-HR
-VHR
-H
Sensor Inner diameter (mm)
Cable length (max. 130m)
High resolution:1 uA /sqrt(Hz)
Very High resolution:0.5 uA /sqrt(Hz)
Radiation-resistant sensor option
BERGOZ Instrumentation
Espace Allondon Ouest
01630 Saint Genis Pouilly, France
Fax: +33-450.426.643 - Tel.: +33-450.426.642
[email protected] www.bergoz.com
bergoz
v.2.1
Instrumentation